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Put together a cuboid with five exactly the same cubes. The surface area is reduced by 24 square centimeters. The surface area of this cuboid is______ Square centimeter
According to the characteristics of the cuboid made of cubes, it can be concluded that when five small cubes are put together, the area of 2 × 4 = 8 small cubes is just reduced, so the surface area of each cube is: 24 △ 8 = 3 (square centimeter), then the surface area of the cuboid is: 3 × 6 × 5-24 = 90-24 = 66 (square centimeter); answer: the surface area of the cuboid is 66 square centimeter 66
Divide a cube with 20 cm edge length into two identical cuboids. What is the surface area of each cuboid? Write the relation and answer
Divide a cube with an edge length of 20 cm into two identical cuboids. The surface area of each cuboid is______ ．
The length of each cuboid: 20 △ 2 = 10 cm, the width and height are 20 cm, 10 × 20 × 4 + 20 × 20 × 2 = 800 + 800 = 1600 (square cm). Answer: the surface area of each cuboid is 1600 square cm. So the answer is: 1600 square cm
RELATED INFORMATIONS
- 1. Place 20 cubes whose edges are 1 cm long into a cuboid whose height is 2 cm. The surface area of the cuboid is () or ()
- 2. A cube has a base area and perimeter of 9 square decimeters. What is the surface area and volume of the cube
- 3. In a cylindrical glass jar with a bottom diameter of 12 cm, a height of 20 cm and a water depth of 15 cm, a cone iron block with a bottom diameter of 10 cm is put into the jar, and the water is cooled Rise 2cm, find the height of the cone iron block
- 4. A rectangular glass tank, the bottom is a square with a circumference of 56 cm, now pour 9 liters of water into the tank, what is the height of the water in the tank? (integer is reserved for the result)
- 5. A cuboid glass fish tank (with cover) is 50cm long, 40cm wide and 35cm high. How much is the water depth of 40 liters in this fish tank?
- 6. A cuboid glass tank, measured from the inside, has a square with a circumference of 6 decimeters at the bottom. Now, 9 liters of water is injected into the tank. How high is the water in the tank?
- 7. A cuboid glass jar is 40 cm long, 25 cm wide and 12 cm deep. After a stone is immersed in water, the water surface rises to 16 cm and the volume of the stone is calculated
- 8. There is a kind of uncovered fish tank, which is 30cm long, 20cm wide and 40cm high. When a fish is put in such a tank, the water surface rises from 18cm to 25cm. What is the volume of the fish?
- 9. The surface area of a cuboid is 386cm3, the bottom area is 40cm3, and the perimeter is 36cm?
- 10. The height of a wooden box is 5 decimeters, the perimeter of the bottom surface is 3 meters, the area of the bottom is 54 square decimeters, and its surface area is [] square decimeters, Just fill in the blanks The circumference of the upper and lower sides of a cuboid is 48 cm. If the height of the cuboid is 20 cm, then the total length of its edges is [] cm, and the maximum volume of the cuboid is [] cubic cm If the length of a cuboid is increased by 5 cm, the surface area will be increased by 80 square cm. The original surface area of the cuboid is [] fast Time limit OK, absolutely
- 11. The bottom of a cuboid is a square. After expanding the side of the cuboid, a square with a circumference of 80cm is formed. What is the volume of the square? What does it look like when the side is unfolded Ask for an answer!
- 12. The circumference of a rectangle is 96cm, and the length is 6cm less than twice the width. How many cm are the length and width? Let the length be xcm, and the width be YCM. According to the meaning of the problem, the equations are () Such as the title~
- 13. The perimeter of a rectangle is between 40 cm and 50 cm. If the ratio of its length to width is 5:7, what is the perimeter and area of the rectangle?
- 14. The circumference of a rectangle is 55cm. It is known that its length is 3.5cm longer than its width. How many cm are the length and width of the rectangle?
- 15. A brick is 25cm in length, 12cm in width and 5cm in thickness. How much space can 1000 bricks occupy? +- x △ is represented by ←, and X △ can be copied. Be sure to write the ideas and notes of each part
- 16. As shown in the figure, a chopstick with a length of 24cm is placed in a cylindrical water cup with a diameter of 5cm at the bottom and a height of 12cm. If the length of the chopstick exposed on the outside is HCM, the value range of H is () A. 0＜h≤11B. 11≤h≤12C. h≥12D. 0＜h≤12
- 17. When a cylinder with a bottom area of 24cm and a height of 12cm is sawed into two identical small cylinders, the surface area increases by () cm;
- 18. The height of a cone is 12cm, and it is semicircle when the side is unfolded? Urgent···· Before 8 o'clock
- 19. A cuboid is 20cm in length, 12cm in width and 6cm in height. After it is divided into two cuboids, what is the minimum and maximum increase in surface area?
- 20. A 60cm, 20cm wide rectangular cardboard, cut a 5cm cube from four corners, and then fold it into a carton What's the surface area of this carton in square centimeter